ams AG - global leader in the design and manufacture of high performance analog ICs (integrated circuits)

AS3490 Lighting Management Unit

Highly efficient 2 to 6 LEDs backlight driver with PWM input

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The AS3490 is an inductive highly efficient DCDC boost converter. The DCDC converter operates at a fixed frequency of 2MHz and includes soft startup to allow easy integration into noise sensitive RF systems. A predictable startup is guaranteed even with very low duty cycle PWM input signals. The output of the DCDC converter is used for three current sources connected to up to 6 LEDs.

Key Features

  • 2 MHz DCDC Boost converter
  • 3 current sources up to 25mA
  • Excellent LED current output ripple <500μA

Key Benefits

  • Small 4.7μH external coil
  • Very high system efficiency of 86%
  • High side current source to simplify layout and thermal management of the LEDs

Product Facts

# of current sinks [HV] 3
- [LV] 0
Max current (mA) [CP]
- [DC-DC] 100
Max Vled [V] 7.8
Features [ LDOs (#)]
- [ Auto ALS]
- [ DLS]
- [ RGB Pattern]
- [ Dimming]
- [ Auto-In]
- [LED test]
Flash [Support]
- [max I (mA)]
Package WL-CSP12 (1.7x1.4)-0.5

Additional Information


Display backlight driver for smart watches, mobile phones, digital cameras, PND and PMPs